On Mon, May 04, 2020 at 03:30:09PM +0800, 王凯 wrote:
> 
> (defface test
>   '((t (:inherit default :background "green")))
>   "Face used by the ivy-posframe."
>   :group 'ivy-posframe)
> 
> (set-face-background
> 'internal-border
> (face-attribute 'test :background)
> (make-frame `((internal-border-width . 100)
>                (parent-frame . ,(window-frame)))))
> 
> (set-face-background
> 'internal-border
> (face-attribute 'test :background)
> (make-frame `((internal-border-width . 100))))
> 
> Eval code above in emacs, internal-border-width works but the
> :background not.

Patch against master attached. It appears to work correctly here, but
I'm slightly concerned it may not work so well on older versions of
macOS, but we'll probably just have to wait and see if anyone
complains.
-- 
Alan Third